NEET UG 2019 · Physics · Question 45
NEET 2019 Physics, question 45
Question 45 of the NEET 2019 paper (code P1) is a Physics question from Moving Charges and Magnetism. Its idea, B vs r Graph for Solid Cylinder, was asked twice, in 2019 and 2022, across NEET 2017–2026. The NTA final answer key gives option 3.
Updated 2026-10-08
Q45 · Physics
A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance, d, from the centre of the conductor, is correctly represented by the figure :
The figure, described in words
Four B vs d graphs as options with R marked on d-axis.
- 1[graph: B constant from d = 0 to R, then decreasing for d > R]
- 2[graph: B zero up to R, jumps to maximum at R, then decreasing for d > R]
- 3[graph: B increases linearly from 0 to maximum at R, then decreases for d > R]Official answer
- 4[graph: B increases linearly from 0 to R, then constant for d > R]
Official answer: option 3 · NTA final answer key
Same idea
B vs r Graph for Solid Cylinder, in other papers
NEET asked this idea twice, in 2019 and 2022. The other question below.
- 2022 Q40From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field…One-line MCQ · Medium
B vs r Graph for Solid Cylinder: every question and how it was framed
The chapter
Moving Charges and Magnetism in ten years of NEET
22 questions from 2017–2026, asked in 10 of 10 papers, about 2.1 a paper. Ampere's Circuital Law alone had 8.